NMWR-9-2815-220 Overhaul Manual for M60 M88 Engine AVDS-1790-2CA, AVDS-1790-2DA, AVDS-1790-2DR Download
Page 375 of 1014
NMWR 9-2815-220 AUTOMATIC INJECTION ADVANCE ASSEMBLY OVERHAUL—Continued 0019 00 TESTING – Continued CAUTION Turn master switch handle OFF if there is no indication of oil or fuel pressure on the gages. Investigate and correct the deficiency before starting the test. (k) Operate test stand at 300 rpm until the oil temperature dial thermometer (item 8, Figure 3) stabilizes at 200 degrees. It may require several minutes to warm the entire system to operating temperature. Note and record electronic counter (item 4, Figure 3) reading (illuminated decimal digits on the front of the counter panel). (l) Press oil drain push switch, located immediately below the oil pressure indicator gage. The gage should register zero (0) psi with the switch depressed. Observe the counter reading. If the counter has changed more than (1) degree, the advance assembly requires adjustment. (m) Release oil pressure drain switch. Turn speed regulator control (item 10, Figure 3) clockwise to increase the speed 600 rpm. Note and record the counter reading at each 200 rpm increment increase, beginning at 600 rpm and continue through to 2600 rpm. (n) Reduce speed to 600 rpm and recheck counter reading. If this reading does not check with the original reading repeat the test. Check the readings taken at each 200 rpm increase against similar points on the approved advance unit curve (Figure 5). If the recorded advance readings fall within the prescribed limits on the curve, the test is complete. If the advance readings do not meet the curve limits, proceed with step (q) below. (o) Turn speed regulator control (item 10, Figure 3) to zero (0), to reduce speed, and counter switch, motor switch, and master switch handle to the OFF position. WARNING Injection pump advance assembly will be hot following test. Operator should wear gloves when removing unit from test stand. (p) Loosen fasteners and remove cover. Remove bearing caps and remove unit from bench. Remove oil transfer shaft. Place injection advance assembly on oil drain tray with small gear end up to drain and cool. Place advance assembly in a clean dirt free container, preferably a polyethylene bag, for storage. (q) Repeat (i) through (n) above to check previous readings. If advance assembly fails to pass the test, it must be adjusted. Note whether advance assembly advances too soon or too late. Either condition can normally be corrected by rotating the advance flyweight adjusting ring (Figure 6). 0019 00-7 Change 1